AT&T LTE, unable to get IPv6

GL-X750 Spitz Version: 3.212 snapshot

I enabled IPv6 from the modem interface, but still Internet is unable to get IPv6

the same SIM card can get IPv6 on the phone

carrier is RedPocket GSMA (AT&T), IPv4 works with ERESELLER APN Activated? Setup your new GSMA line

EP06-A, AT+CGDCONT? does show IPV4V6 PDP_type

How can I troubleshoot this?

can you share your modem and ipv6 config?

Is this what you are looking for?

As far as I know, QCM has some issues with IPV6 support, you can try 3g or QMI